How use DMA without bios

Jia Tang

Hi,

I have a question,I have read some examples that use the EDMA3 LLD (low level driver),but it controlled by bios,now,I want use the EDMA without bios.how to do this?

over 14 years ago

0 David Friedland over 14 years ago

TI__Mastermind 18320 points

Jia,

EDMA LLD is independent of DSP/BIOS in that it is a separate library with its own API. You can get some introductory information about this at the following Wiki page:

http://processors.wiki.ti.com/index.php/Programming_the_EDMA3_using_the_Low-Level_Driver_%28LLD%29

0 Brad Griffis over 14 years ago

TI__Guru*** 125430 points

Why don't you want to use BIOS?

The EDMA LLD requires an underlying OS as it depends on semaphores, etc. Therefore if you are intent on moving away from BIOS then you probably will want to move away from EDMA LLD as well. Here is an example of how to program the EDMA without using LLD:

http://processors.wiki.ti.com/index.php/Programming_EDMA_without_EDMA3LLD_package

You might also want to go "a happy medium" and keep BIOS but get rid of LLD if this is a matter of code size.

Processors

Processors forum

How use DMA without bios